Multiple-disk clutch



W. TURNBULL.

MULTIPLE DISK CLUTCH.

APPLICATION HLED 1AN.I\. 917.

1 ,327,576. v Patented Jan. 6, 1920.

2 SHEETS-SHEET l.

1N ENTOR W. TURNBULL.

MULTIPLE DISK GLUTCH.

APPLlcATloN FILED. 1AN.1|. 1917.

1,327,576. Patented Jan. 6,1920.

2 SHEETS-SHEET 2.

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'UNITED sTATEs lPATENT oFFroE.

WILLIAM TURNBULL, OF STOCKTON, CALIFORNIA, ASSIGNOR TO THE HOLT MANUFAC- TURIN G COMPANY, OF ySTOCKTON, CALIFORNIA, A CORPORATION OF CALIFORNIA.

MULTIPLE-DISK CLUTCH.

Specification of Letters Patent.

Patented Jan. 6, 1920.

Application led January 11, 1917. Serial No. 141,772.

To all whom t may concern:

Be it known that I, IVILLIAM TURNBULL, a citizen of the United States, residing at Stockton, in the countv of San Joaquin and State of California, have invented new and useful Improvements in Multiple e Disk Clutches, of which the following is a specification.

This invention relates to multiple diskr clutches; and has for its object to simplify and improve the construction and operation of such devices.

In the present form of the invention, I employ a clamping device, actuated by a toggle joint to increase the pressure on the pressure plate, so that the springs employed in connection therewith may be light enough to be compressed without difficulty by the operator but their effective pressure, or that brought to bear against the disk, will be multiplied several fold by means of the toggle-actuated clamping devices, and the tendency of the pressure plate to move outward, whenv the clutch members are engaged,

will be lpositively restrained by the toggle mechanism -without imparting any strains l to the pressure springs.

One form which my invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which- Figure 1 shows a side elevation of a clutch embodying my invention.

Fig-2 shows a sectional view, taken on the line^2f2 of`Fig.- 1.

\ Figa?)v1 shows a sectional the line of Fig. 2. ,`Fig. 4 shows a detail, sectional. view of one of the bracket members for the clamping devices on line 4-4 of Fig. 3.

View, taken on Fig. 5 is a detail perspective View of the annular pressure. plate 18.

Fig. 6 is a perspective view of the clutch actuating collar. 4

Fig. 7 is a perspective View of the fiange 2 2, showing the yokes 28.

The clutch assembled in its present form includes a driving shaft 10, on which is fixed a driving clutch member 11 carrying a set of spaced driving disks 12. secured thereto by keys 13, said disks being preferably of the dry type faced with leather, fiber or similar friction material. The driving clutch member 11 is provided with an extended hub or shoulderI 19. A driven member 14, in the form of a drum, is mounted upon a sleeve l5 carried loosely on the shaft 10 and has disks 16 secured thereto by keys 17, said disks 16 being fitted between the disks 12. An annular plate 18 engages the disks at the front of the drum, being supported upon the inner surface of the annular disk carrying fiange formed on the member 11.

For actuating the pressure plate, I employ a series of clamping levers 20 pivoted to brackets 2l, the latter formed on a fianged collar 22 carried on hub 19 of the driving member. A lug 23, on the clamping lever, near the fulcrum thereof, is adapted to engage the annulus of the pressure plate, when the lever is moved outwardly to force said plate inwardly against the disks. For actuating said clamping levers I connect each with a link 24, pivoted to a clutch actuating collar 2G, the latter splined on hub 19 of the driving clutch member. Fixed upon the clutch actuating collar is a series of stud bolts 27, projecting inwardly through an aperture in the end of a yoke 28, which yoke is fixed upon the ianged collar 22. A spring 29 act-s between the head 30 of the bolt and the end o-f the yoke to thrust the bolt inwardly, carrying with it the clutch actuating collar.

As Shown in Fig. 4, the ianged collar 22 is retained in place by. means of stud bolts 31 fixed to thedriving clutch member andprojecting through bosses on the brackets 21. 'A

When the clutch actuatino' collar is at its inward limit of movement tie links -24 will be at right angles to the axis of the driving shaft, in which position the clamping le* vers 20 will be moved outwardly into aA position parallel with the axis of said shaft and in so moving the lugs 23 will have forced the pressure plate inwardly a suiicient distance to put the driving and driven disks into operative relation. It will be seen that when the clutch is set, the links 24 and clamping levers 20 form a toggle joint for positively retaining the pressure plate in position to hold the driving and driven disks in operative relation and, therefore, the constant strains usually imposed upon the springs are entirely removed at this time.

To release the clutch, the operator pulls little power as compared with the power required to actuate the pressure plate.

Various changes in the construction and arrangement of the several parts herein shown and described may be employed without departing from the spirit of my invention as disclosed in the appended claims'.

Having thus described my invention, what I claim and desire to secure by LettersPatent isl. A multiple disk clutch including driv-l ing and driven members and interposed friction disks, a pressure plate for the disks,

an actuating collar for said pressure plate, a plurality of springs acting onsaid collar at spaced intervals about its circumference,

-v and power increased lever connections between the clutch actuatingcollar and pressure plate for actuating the latter.

2. A multiple disk clutch including driving and driven members and interposed friction disks, a pressure plate for the disks, a clutch actuating collar spring pressed at spaced intervals about its circumference, power increased lever connections between the clutch actuating collar and pressure plate for actuating the latter, said lever connections comprising clamping levers for the pressure plate, and link connections between said clampinglevers and the clutch actuatv actuating device projecting through said yoke members, springs on the stud bolts forcing the clutch actuating device inwardly, and connections between said clutch actuating device and the pressure plate for actuating the latter.

4. A multiple disk clutch including driving and driven members with interposed friction disks, a pressure plate for the disks, a clutch actuating device rotatable with the driving member and shiftable relatively thereto, yoke members carried by the driving clutch member, stud bolts on the clutch actuating device projecting through said yoke members, springs on the stud bolts forcing the clutch actuating device inwardly,- and connections between said clutch actuating device and the pressure plate for actuating thelatter, said connections including clamping levers pivotally supported by the driving member and engaging the pressure plate, and -links connecting said clamping levers with the shiftable clutch actuating device.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

WILLIAM TURNBULL.

Witnesses:

J. Gr. SMITH, W. J. TALBOT. 

